22. They were surprised that a child should work out the problem ___________ they them selves couldn’t.

　A. once　　 B. then　　 C. while　　 D. if

答：C。while是并列连词，意为“而，却”。

21. -__________WouLd you like to come to dinner tonight?

　 -I’d like to, _________I’m too busy.

A. and　　 B. so　　　 C. as　　 D. but

答：D。句中明显看出是转折关系。

20. _________ the poem a second time, the meaning will become clearer to you.

A. Your having read　　　 B. While reading

C. If reading　　　　　　 D. When you read

19. ___________you have seen both fighters, __________will win?

　A. Since, do you think who　　　

　B. As, who you think

　C. When, whoever　　 　　　

D. Since, who do you think

答：D。 Since既然。do you think为插入语。

18. _____________ you’ve got a chance, you might as well make full use of it.

A.　 Now that　　 B. After　　　　

　C. Although　　 D.　 As soon as

答：A。now that既然，相当于since的用法。

17. -I’m going to the post office.

　 - _______ you’re there, can you get me some stamps?

A. As　　 B. While　　 C. Because　　 D. If

答：B。while 当……的时候，在……之时，和……同时。如 While in London he studied music. 他在伦敦的时候研究音乐。

16. _________I like the car, I don’t like the color of it.

A. Unless　 B. However　 C. While　　 D. If

答；C．while＝ahhough之用法，意为“虽然”。

15. Would you like a cup of coffee_________ shall we get down to business right away?

A. and　　　 B. then　 　C. or 　　D. otherwise

答：C。or或者，其他选项与句意不符。

14. If we work with a strong will, we can overcome any difficulty, ___________ great it is.

A. what　　　　 B. how

　 C. however　　　 D. whatever

答；C。whatever后接名词，however后接形容词或副词。

13. She thought I was talking about her daughter, __________, in fact, 1 was talking a-bout my daughter.

A. whom　 　B. where　 C. which　　 D. while

答：D。while为连词，表示转折(常带有对比之意)，表示“而，却”。